Figure-of-Merit for a Cold Coupled Moderator at the SNS Second Target Station suited for Direct Geometry Inelastic Spectrometers

Content Provider	Scilit
Author	Ehlers, Georg Sala, Gabriele Gallmeier, Franz Herwig, Kenneth W.
Copyright Year	2018
Description	Journal: Journal of Physics: Conference Series The suite of moderators for the Second Target Station (STS) at the Spallation Neutron Source (SNS) in Oak Ridge is currently undergoing the planning stage at which various options and configurations are being considered. The current plans for the instrument suite include two direct geometry inelastic spectrometers, CHESS and HERTZ, which will receive beam from cold moderators and work mostly in the 1-20 meV incident energy range. CHESS will be a relatively short (wide bandwidth) instrument that is dedicated to studying small samples $(~mm^{3}$) with coarse energy resolution (2.5 – 5% of E$ _{i}$). HERTZ on the other hand will be designed to achieve very good energy resolution, 1 – 3% of E$ _{i}$, using a long secondary flightpath with a ~ 4 × 4 $cm^{2}$ beam on sample. In this contribution, we will discuss the implications of these design requirements for the optimal moderator pulse width, and for the repetition rate that would be best suited for the spectrometers.
Related Links	http://iopscience.iop.org/article/10.1088/1742-6596/1021/1/012032/pdf
ISSN	17426588
e-ISSN	17426596
DOI	10.1088/1742-6596/1021/1/012032
Journal	Journal of Physics: Conference Series
Issue Number	1
Volume Number	1021
Language	English
Publisher	IOP Publishing
Publisher Date	2018-05-01
Access Restriction	Open
Subject Keyword	Journal: Journal of Physics: Conference Series Nuclear Energy and Engineering
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy